Question 1

What is Abiraterone?

Accepted Answer

Abiraterone is an androgen biosynthesis inhibitor. It works by interfering with a specific enzyme that the body needs to produce androgens, which are male hormones such as testosterone.

By reducing the levels of these hormones, the medication helps slow the growth of cancer cells that rely on androgens to spread. It targets hormone production in the adrenal glands, the testes, and the tumor itself.

Question 2

What is Abiraterone used for?

Accepted Answer

Abiraterone is used to treat prostate cancer.

Question 3

How does Abiraterone work?

Accepted Answer

Mechanism of Action

Abiraterone belongs to a group of medicines known as androgen biosynthesis inhibitors. It works by reducing the production of male hormones, such as testosterone, which prostate cancer cells often need to grow and spread.

Targeting the CYP17 Enzyme

The medication specifically targets and blocks an enzyme called CYP17. This enzyme is a critical part of the process the body uses to create androgens. By inhibiting this enzyme, abiraterone significantly lowers the amount of these hormones available to the cancer cells.

Unlike some other hormone therapies, abiraterone stops hormone production in three different areas of the body:

The testes: The primary source of male hormones.

The adrenal glands: Small glands that produce various hormones.

Prostate cancer cells: The tumor itself can sometimes produce its own hormones to fuel growth.

Combination Therapy

Because blocking the CYP17 enzyme also interferes with the production of other vital hormones like cortisol, abiraterone must be taken with a corticosteroid. This helps maintain the body's hormone balance and prevents certain side effects that could occur if cortisol levels become too low.

Question 4

What are the brand names for Abiraterone?

Accepted Answer

Abiraterone is sold under the brand names Zytiga and Yonsa .

Question 5

What are the active ingredients in Abiraterone?

Accepted Answer

The active ingredient in Abiraterone is abiraterone .

Question 6

What are the side effects of Abiraterone?

Accepted Answer

Common side effects of Abiraterone may include:

joint swelling or discomfort

low potassium

fluid retention

and others

Always consult with a healthcare professional about potential side effects.

Question 7

What drug class is Abiraterone?

Accepted Answer

Abiraterone belongs to the androgen biosynthesis inhibitor drug class.

Question 8

What is the dosage of Abiraterone and how do I take it?

Accepted Answer

How to Take Abiraterone

Abiraterone is a tablet taken by mouth, usually once per day. It is important to follow the specific instructions provided by a healthcare professional, as different formulations of this medication have different requirements regarding food intake.

Standard tablets: These must be taken on an empty stomach. Do not eat any food for at least two hours before taking the dose and for at least one hour after taking it. Taking these tablets with food can cause the body to absorb too much of the medication.

Micronized tablets: Certain versions of abiraterone may be taken with or without food. Always follow the specific instructions for the version prescribed.

The tablets should be swallowed whole with water. Do not crush, chew, or break the tablets. Abiraterone is almost always prescribed in combination with a corticosteroid, such as prednisone or methylprednisolone, which helps prevent certain side effects.

Missed Dose

If a dose is missed, skip it and take the next dose at the regular time the following day. Do not take extra medicine or double the dose to make up for a missed one. If more than one dose is missed, contact a healthcare provider for guidance.

Question 9

Is Abiraterone safe during pregnancy and breastfeeding?

Accepted Answer

Pregnancy and Handling Precautions

Abiraterone is not indicated for use in women. It is known to cause fetal harm and potential pregnancy loss. Because the drug can be absorbed through the skin, women who are pregnant or who may become pregnant should avoid touching the tablets. If handling is required, gloves should be worn, especially if the tablets are crushed or broken.

Contraception for Men

Men who are taking abiraterone and have female partners of reproductive potential should use effective birth control to prevent pregnancy. Guidelines include:

Using a condom along with another effective form of contraception during treatment.

Continuing to use these methods for at least three weeks after the final dose of the medication.

Breastfeeding and Fertility

It is not known whether abiraterone passes into human breast milk, as the medication is not used in females. Regarding fertility, animal studies have shown that the drug may decrease male fertility. Men who have concerns about their fertility should speak with a healthcare professional before starting treatment.

Question 10

What forms and strengths does Abiraterone come in?

Accepted Answer

Available Forms

Abiraterone is available in the following oral forms:

Tablets: Standard abiraterone acetate tablets.

Micronized Tablets: A specific formulation of abiraterone acetate that uses different technology for absorption.

Combination Tablets: A single tablet that contains both abiraterone acetate and other active medications.

Standard tablets and micronized tablets are not equivalent and cannot be substituted for one another. These different forms have different administration requirements, particularly regarding food intake.

Question 11

What is the FDA approval status of Abiraterone?

Accepted Answer

FDA Approval History

The U.S. Food and Drug Administration (FDA) first approved abiraterone acetate in 2011. It was initially authorized for patients with metastatic castration-resistant prostate cancer who had previously received chemotherapy. Its use was later expanded to include patients who had not yet received chemotherapy and those with metastatic high-risk castration-sensitive prostate cancer.

Approved Indications

Abiraterone is currently approved for the treatment of:

Metastatic castration-resistant prostate cancer (mCRPC).

Metastatic high-risk castration-sensitive prostate cancer (mCSPC).

In 2023, the FDA also approved a combination of niraparib and abiraterone acetate, administered with prednisone, for the treatment of adults with BRCA-mutated metastatic castration-resistant prostate cancer.

Regulatory Requirements and Formulations

Abiraterone is available in two main forms: standard abiraterone acetate and a micronized version. These formulations are not interchangeable because they have different dosing requirements and absorption rates. Both forms must be administered in combination with a corticosteroid, such as prednisone or methylprednisolone, to help manage potential side effects related to hormone changes.

There are currently no Boxed Warnings or Risk Evaluation and Mitigation Strategies (REMS) programs required for this medication, though the FDA requires specific monitoring for liver function, blood pressure, and potassium levels during treatment.

Question 12

What should I know about Abiraterone and cost?

Accepted Answer

Factors Affecting Cost

Several factors influence the out-of-pocket cost for abiraterone:

Generic vs. Brand Name: Abiraterone is available as a generic medication, which is typically significantly less expensive than brand-name versions such as Zytiga or Yonsa.

Formulation Type: Standard abiraterone acetate and micronized abiraterone acetate (Yonsa) are different formulations. Because they are not milligram-for-milligram equivalents, their costs and insurance coverage tiers may differ.

Insurance Coverage: Most Medicare Part D and commercial insurance plans provide coverage for abiraterone, but it is often placed on a higher specialty tier, which may require a significant copayment or coinsurance.

Financial Assistance

For patients who have difficulty affording the medication, options may include:

Patient Assistance Programs: Some pharmaceutical manufacturers offer programs to provide medications at a lower cost or for free to eligible individuals without insurance or with limited coverage.

Copay Cards: Manufacturers of brand-name formulations may offer savings cards to help reduce out-of-pocket costs for patients with commercial insurance.

Because abiraterone is a specialty medication, it is often dispensed through specialty pharmacies rather than standard retail locations. Patients should check with their insurance provider and specialty pharmacy to determine the exact cost under their specific plan.

Abiraterone

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